WO2020000987A1 - Sound generation device and portable terminal - Google Patents

Abstract

Disclosed in the present invention are a sound generation device and a portable terminal. The sound generation device comprises a vibration system and a magnetic circuit system, and the vibration system and the magnetic circuit system are fixedly mounted on an outer casing; the outer casing comprises a first casing and a second casing that are fixedly connected together; the vibration system comprises a first diaphragm, and the magnetic circuit system comprises a magnetic yoke, wherein the first diaphragm is mounted on a surface of the first casing away from the second casing, and the magnetic yoke and the second casing are injection molded into one body. In the sound generation device of the present invention, the outer casing is divided into two partial casings, and the magnetic yoke is injection molded and fixed onto the second casing, so that the magnetic yoke and the second casing become one integrally arranged component. Thus, the assembly process of the magnetic yoke and the outer casing may be reduced, the assembly efficiency and the connection strength of the sound generation device may be improved, and a larger space may be provided for the magnetic circuit system, thereby improving the product performance.

Description

Sound generating device and portable terminal Technical field

The invention relates to the technical field of electroacoustics, and in particular, to a sound generating device and a portable terminal.

Background technique

At present, sound emitting devices have been widely used as important components of terminals with audio playback functions. Some terminals, especially portable terminals, such as mobile phones, tablet computers, and earphones, have very limited installation space for the sound emitting device, so the volume of the sound emitting device has become smaller and smaller.

For the existing sound-emitting device, the shell uses an independent plastic part, and the magnetic yoke is generally bonded to the shell. However, due to the small volume of the sound-emitting device, the process of bonding the magnetic yoke to the housing becomes very Trouble, which will cause great inconvenience to the assembly of the sounding device, and the magnetic circuit space will be limited to a certain extent.

Summary of the invention

The main purpose of the present invention is to provide a sound generating device, which aims to solve the technical problem of inconvenient assembly of the magnetic yoke and the shell of the existing sound generating device.

In order to achieve the above object, a sound-emitting device provided by the present invention includes a vibration system and a magnetic circuit system, and the vibration system and the magnetic circuit system are fixed on a housing, and are characterized in that the housing includes a connection and a fix A first housing and a second housing, the vibration system includes a first diaphragm, and the magnetic circuit system includes a magnetically permeable yoke, wherein the first diaphragm is installed away from the first housing On one side of the second casing, the magnetic yoke and the second casing are injection-molded integrally.

Optionally, the magnetic circuit system further includes a central magnetic circuit portion and a side magnetic circuit portion, and a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion;

The central magnetic circuit portion includes a central magnet provided on the magnetic yoke and a central magnetic plate provided on the central magnet, and the side magnetic circuit portion includes a side spaced apart from the central magnetic plate. The magnetically permeable plate is fixed to the first case by injection molding.

Optionally, the side magnetic circuit portion further includes a first side magnet and a second side magnet respectively provided on opposite sides of the center magnet, and the side magnetic guide plate includes the first side magnet respectively And the second side magnetically permeable plate on the second side magnet.

Optionally, the magnetic yoke has a flat plate shape and is configured to constitute a bottom wall of the second casing.

Optionally, a concave / convex structure is provided on a side of the first housing facing the second housing, and a matching side is provided on a side of the second housing facing the first housing. Convex / concave structure; the first housing and the second housing are positioned by the matching convex and concave structures, and the first housing and the second housing are glued The knots are fixed together.

Optionally, the first housing is provided with a first electrical connection member and a second electrical connection member for electrically connecting the voice coil of the vibration system with an external circuit, and the first electrical connection member and the second electrical connection member are provided on the first housing. The electrical connection pieces are respectively connected with two leads of the voice coil of the vibration system.

Optionally, the first case is provided in a rectangular shape, and the first and second electrical connectors are provided at one end of a short side of the first case.

Optionally, one end of the short side of the first housing is provided with a mounting protrusion outwardly;

The first electrical connection member has a first pad and a second pad that are respectively exposed at the mounting protrusion and located inside the first housing; the second electrical connection member has a respectively exposed at the installation A convex portion and a third pad and a fourth pad located inside the first casing;

The first pad and the third pad are used for electrical connection of an external circuit.

Optionally, a third electrical connector and an electrical adapter are further provided on the first casing, and the third electrical connector is disposed on an end of the first casing remote from the mounting protrusion, Two ends of the electrical adapter are connected to the third electrical connector and the second electrical connector, respectively;

One lead of the voice coil is electrically connected to the second electrical connector in turn via the third electrical connector and the electrical adapter, and the other lead is electrically connected to the first electrical connector.

Optionally, the third electrical connector has a fifth pad exposed on the upper side of the first case, and a sixth pad exposed on the lower side of the first case, and the second pad Exposed on the upper side of the first case, the fourth pad is exposed on the lower side of the first case, and the sixth pad and the fourth pad are close to the first case Set on the same long side of the body;

Two ends of the electrical adapter are connected to the sixth pad and the fourth pad, respectively;

Two leads of the voice coil are connected to the fifth pad and the second pad, respectively.

Optionally, a lead groove extending from the sixth pad to the fourth pad is provided on the lower side of the first housing, and the electrical adapter is buried in the lead groove.

Optionally, the vibration system further includes a second diaphragm disposed opposite to the first diaphragm, and the second diaphragm is mounted on a side of the second casing remote from the first casing. And the voice coil of the vibration system is disposed below the first diaphragm;

The magnetic circuit system is provided between the first diaphragm and the second diaphragm, a first acoustic cavity is formed between the magnetic circuit system and the first diaphragm, and the voice coil portion extends into the magnetic In the magnetic gap of the magnetic circuit system, a second acoustic cavity is formed between the magnetic circuit system and the second diaphragm, and an air guiding hole is provided between the first acoustic cavity and the second acoustic cavity.

Optionally, the sound emitting device further includes a connector, the connector is at least partially provided in the air guide hole, an upper end of the connector is fixedly connected to the first diaphragm, and a lower end is connected to the second diaphragm. The membrane is fixedly connected.

Optionally, the air guide hole includes a side air guide hole provided on the second housing and connecting the magnetic gap of the magnetic circuit system and the second acoustic cavity, and a plurality of side air guide holes are provided. A plurality of the side air guide holes are arranged at intervals along the circumferential direction of the magnetic gap;

The connecting member includes a connecting base plate and a plurality of connecting convex portions protruding from the connecting base plate. The connecting base plate is provided between the second casing and the second diaphragm, and is connected to the first The two diaphragms are fixedly connected, and the plurality of connection protrusions are respectively fixedly connected to the first diaphragm through a plurality of the side air guide holes respectively.

Optionally, the connection convex portion is provided in a plate shape; an upper end of the connection convex portion is formed with a connection flange that is bent inward, outward, or partially inward, and outward; and / or

The connection convex portion is provided in a plate shape, and the lower end of the side of the connection convex portion is bent inward to extend to form a side reinforcement portion connected to the connection bottom plate; and / or

A reinforcing rib connected to the connection bottom plate is provided at the lower end of the inner side of the connection convex portion; and / or

The connection bottom plate is provided in a hollow shape; and / or

The connection convex portion is provided in a plate shape, and the connection convex portion is provided in a hollow shape; and / or

The connecting bottom plate is provided in a square shape, a circular shape, a racetrack shape, or an oval shape.

Optionally, the first diaphragm includes a first central portion, a first folded ring portion provided around the first central portion, and a first fixed portion provided around the first folded ring portion; and the connecting convex portion is fixed to The lower side of the first central portion, the first folded ring portion is a structure composed of one protrusion, or the first folded ring portion is a wavy structure composed of at least one protrusion and at least one depression; and / or

The second diaphragm includes a second center portion, a second folded ring portion provided around the second center portion, and a second fixed portion provided around the second folded portion; the connection base plate is fixed to the second center portion. On the upper side, the second folded ring portion is a structure composed of one protrusion, or the second folded ring portion is a wavy structure composed of at least one protrusion and at least one depression.

Optionally, the first diaphragm further includes a first reinforcing portion coupled to the first central portion, and a periphery of the first reinforcing portion is adhered to the first central portion corresponding to the connecting convex portion. A first gap at the junction; and / or

The second diaphragm further includes a second reinforcing portion coupled to the second central portion, and a peripheral edge of the second reinforcing portion is provided corresponding to a peripheral edge of the connection base plate and the second central portion is bonded. There is a second gap.

Optionally, the connecting member is a structure in which a second reinforcing portion coupled to the second diaphragm is integrally bent and extended in a direction close to the second diaphragm / voice coil;

Alternatively, the voice coil is wound around the voice coil skeleton, and the connecting member is a structure in which the voice coil skeleton is integrally bent and extended in a direction close to the second diaphragm / second reinforcing portion.

Optionally, the air guide hole includes a central air guide hole passing through an intermediate position between the magnetic yoke and the magnetic circuit system.

The present invention also provides a portable terminal, which includes a housing, and the housing has an accommodating cavity inside, which is further characterized in that it further comprises a sound emitting device as described above, wherein the sound emitting device is installed in the accommodation cavity, The casing is provided with a first sound hole corresponding to the first diaphragm and a second sound hole corresponding to the second diaphragm.

Optionally, the casing has a front surface and a rear surface opposite to each other, the first sound hole is provided on the front surface, and the second sound hole is provided on the reverse surface.

The sound generating device of the present invention fixes the magnetic yoke on the second casing by injection molding, so that the magnetic yoke and the second casing become a single component integrally provided, thereby reducing the assembly process of the magnetic yoke and the casing. Therefore, the problem of inconvenient assembly of the magnetic yoke and the shell is solved; especially for a sound generating device with a small volume, its assembly efficiency can be greatly improved. At the same time, compared with bonding the magnetic yoke to the casing, the present invention fixes the magnetic yoke to the second case by injection molding, which can improve the connection strength of the magnetic yoke and the second case, thereby improving the magnetic yoke. The strength of the connection with the shell prevents loosening, which can improve the reliability of the sounding device product. In addition, the present invention splits the traditional plastic shell into two parts of the shell and assembles them along the assembly direction. Compared with the prior art, it can give more space to the magnetic circuit system and further improve product performance.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structure shown in the drawings without paying creative labor.

FIG. 1 is a schematic front structural diagram of an embodiment of a sound generating device according to the present invention; FIG.

FIG. 2 is a schematic diagram of a rear structure of the sound generating device in FIG. 1; FIG.

FIG. 3 is a schematic cross-sectional view of the sound generating device in FIG. 1; FIG.

4 is a schematic diagram of a partial structure in FIG. 3;

5 is a schematic cross-sectional view of the sound generating device in FIG. 1 from another perspective;

FIG. 6 is a schematic diagram of an explosion structure of the sound generating device in FIG. 1; FIG.

7 is a schematic structural diagram of a casing in FIG. 1;

8 is a schematic structural diagram of a second casing in FIG. 7;

9 is a schematic structural diagram of a front surface of a sound generating device of the present invention when a voice coil is mounted on a first housing;

FIG. 10 is a schematic diagram of the rear structure when the voice coil in FIG. 9 is mounted on the first housing; FIG.

11 is a schematic structural diagram of a magnetic circuit system of a sound generating device according to the present invention;

12 is a schematic structural diagram of a second embodiment of a sounding device according to the present invention;

13 is a schematic structural diagram of a third embodiment of a sounding device according to the present invention;

14 is a schematic structural diagram of a fourth embodiment of a sounding device according to the present invention;

15 is a schematic structural diagram of a fifth embodiment or a sixth embodiment of a sound generating device according to the present invention;

16 is a schematic structural diagram of a seventh embodiment of a sounding device according to the present invention;

17 is a schematic front structural diagram of an embodiment of a portable terminal according to the present invention;

FIG. 18 is a schematic structural diagram of the back of the portable terminal in FIG. 17; FIG.

FIG. 19 is a schematic view of a partial cross-sectional structure at A in FIG. 17.

BRIEF DESCRIPTION OF THE DRAWINGS

Label	name	Label		name
100	Sound device	311	Mounting protrusion
10	Vibration system	312	Lead slot
11	First diaphragm	32	Second shell
111	First center	33	Third sound hole
112	First folding ring section	34	Damping
113	First fixed part	41	First electrical connection
114	First reinforcement	411	First pad
1141	First gap	412	Second pad
12	Second diaphragm	42	Second electrical connection
121	Second center	421	Third pad
122	Second folded ring section	422	Fourth pad
123	Second fixed part	43	Third electrical connection
124	Second reinforcement	431	Fifth pad
1241	Second gap	432	Sixth pad
13	Voice coil	44	Electric adapter
20	Magnetic circuit system	50	Connector
twenty one	Magnetic yoke	51	Connection plate
twenty two	Magnetic gap	52	Connection protrusion
twenty three	Central magnet	521	Join flanging
twenty four	Center magnetic plate	522	Side reinforcement
25	Side magnetic guide plate	523	Stiffener
251	First side magnetically permeable plate	60	The front cover
252	Second magnetically permeable plate	70	Back cover
26	First side magnet	1000	Portable terminal
27	Second side magnet	200	case
28	Side vent	201	Receiving cavity
30	shell	202	First sound hole
31	First shell	203	Second sound hole

The realization of the purpose, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the drawings.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back, etc.) in the embodiment of the present invention, the directional indication is only used to explain in a specific posture (as shown in the accompanying drawings) (Shown) the relative positional relationship and movement of each component, etc., if the specific posture changes, the directivity indication will change accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiment of the present invention, the descriptions of "first", "second", etc. are only used for description purposes, and cannot be understood as instructions or hints Its relative importance or implicitly indicates the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on those that can be realized by a person of ordinary skill in the art. When the combination of technical solutions conflicts or cannot be achieved, such a combination of technical solutions should be considered non-existent. , Is not within the scope of protection claimed by the present invention.

The invention provides a sound generating device.

In the embodiment of the present invention, as shown in FIG. 1 to FIG. 8, the sound emitting device 100 includes a vibration system 10, a magnetic circuit system 20, and an auxiliary system. The auxiliary system includes a housing 30, the vibration system 10, and a magnetic circuit. The system 20 is mounted on the casing 30, and the casing 30 includes a first casing 31 and a second casing 32 connected and fixed to each other; the vibration system includes a first diaphragm 11, wherein the first diaphragm 11 Mounted on the side of the first casing 31 remote from the second casing 32, the magnetic circuit system 20 includes a magnetically permeable yoke 21, and the magnetically yoke 21 is injection-molded with the second casing 32 as One.

It can be understood that, in the sound generating device 100 of the present invention, the magnetically conductive yoke 21 is injection-molded and fixed on the second casing 32, so that the magnetically conductive yoke 21 and the second casing 32 become an integral component, thereby reducing the magnetically conductive yoke. The assembling process of the 21 and the casing 30 solves the problem of inconvenient assembly of the magnetic yoke 21 and the casing 30; especially for the sound emitting device 100 with a small volume, the assembly efficiency can be greatly improved. At the same time, compared to bonding the magnetic yoke 21 to the casing 30, the present invention fixes the magnetic yoke 21 to the second housing 32 by injection molding, which can improve the connection strength between the magnetic yoke 21 and the second housing 32. As a result, the connection strength between the magnetic yoke 21 and the casing 30 can be improved, and loosening can be prevented, thereby improving the reliability of the product of the sound emitting device 100, and further improving the quality of the sound emitting device 100 and the portable terminal.

Further, as shown in FIG. 3 to FIG. 5 and FIG. 11, the magnetic circuit system 20 further includes a central magnetic circuit portion and a side magnetic circuit portion, and a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion. twenty two;

The central magnetic circuit portion includes a central magnet 23 provided on the magnetic yoke 21 and a central magnetic plate 24 provided on the central magnet 23, and the side magnetic circuit portion includes a distance from the central magnetic plate 24. The side magnetically permeable plate 25 is fixed to the first casing 31 by injection molding.

Compared with the prior art, the edge magnetic plate is adhered to the casing 30. The sound generating device 100 of the present invention is fixed to the first case 31 by injection molding the edge magnetic plate 25, so that the edge magnetic plate 25 and the first A casing 31 becomes a single component provided integrally, thereby reducing the assembly process of the side magnetically permeable plate 25 and the casing 30, thereby solving the problem of inconvenient assembly of the side magnetically permeable plate 25 and the casing 30; especially for a small volume For the sound emitting device 100, its assembly efficiency can be further improved. At the same time, compared with directly adhering the side magnetically permeable plate 25 to the casing 30, the present invention fixes the side magnetically permeable plate 25 to the first case 31 by injection molding, which can improve the side magnetically permeable plate 25 and the first case 31. The connection strength can be improved, thereby increasing the connection strength between the magnetically permeable plate 25 and the casing 30 to prevent loosening, thereby further improving the reliability of the sounding device 100 product.

Further, as shown in FIG. 3 to FIG. 5 and FIG. 11, the edge magnetic circuit portion further includes a first edge magnet 26 and a second edge magnet 27 respectively disposed on opposite sides of the center magnet 23. The magnetically permeable plate 25 includes a first side magnetically permeable plate 251 and a second side magnetically permeable plate 252 provided on the first and second side magnets 26 and 27, respectively. That is, the magnetic circuit system 20 of the sound generating device 100 is set as a three-magnet magnetic circuit system, and a magnetic gap 22 thereof is formed between the center magnet 23 and the side magnet.

Further, as shown in FIGS. 8 and 11, the magnetic yoke 21 has a flat plate shape and is provided as a bottom wall of the second casing 32. This not only facilitates injection-molding the magnetically permeable yoke 21 on the second housing 32. Moreover, by setting the magnetically yoke 21 as the bottom wall of the second casing 32, the thickness of the magnetically yoke 21 can be increased as much as possible without increasing the thickness of the second casing 32 and the casing 30, so that The magnetic permeability of the magnetic yoke 21 is improved, and at the same time, the miniaturization design of the sound generating device 100 is facilitated. In addition, the shell is divided into two parts of the shell. Compared with the prior art, it can also increase the space of the magnetic circuit and further improve the acoustic performance of the product.

In this embodiment, the housing 30 is substantially rectangular, and the magnetic yoke 21 is also substantially rectangular. The first side magnet 26 and the second side magnet 27 are respectively provided on two lengths of the magnetic yoke 21. Side to side.

Specifically, as shown in FIG. 11, the center magnet 23, the first side magnet 26, and the second side magnet 27 are all adhered to the upper side of the second casing 32.

Further, as shown in FIG. 7 to FIG. 11, a side of the first casing 31 facing the second casing 32 is provided with a depression / protrusion structure (specifically, it can be distributed at four corners), and the second casing The side of the body 32 facing the first shell 31 is provided with a matching convex / concave structure (which may be correspondingly distributed at the four corners); the first shell 31 and the second shell 32 are matched with each other. The convex and concave structures are positioned. In addition, the first casing 31 and the second casing 32 may be fixed together by adhesive bonding. This facilitates the assembly of the two-part housing and allows for more accurate positioning. Specifically, the positioning structure may be set as a positioning column structure.

Further, as shown in FIG. 2 and FIG. 7, a third acoustic hole 33 is formed at a splicing position of the first casing 31 and the second casing 32, and the third acoustic hole 33 communicates with the sound emitting device 100. A sound cavity; a damping 34 is pasted on the third sound hole 33. In this way, the internal and external air pressure and temperature of the sound generating device 100 can be balanced to ensure the normal operation of the sound generating device 100.

In this embodiment, two third sound holes 33 are provided, and the two third sound holes 33 are respectively provided on the long side of the casing 30.

Of course, the magnetic circuit system 20 of the sound generating device 100 may also be provided as a single-magnet magnetic circuit system. For example, in other embodiments of the present invention, the magnetic yoke 21 includes a bottom wall and a sidewall provided on a peripheral edge of the bottom wall, and the bottom wall of the magnetic yoke 21 is injection-molded and fixed on the second housing 32, and The bottom wall of the magnetically conductive yoke 21 is set as the bottom wall of the second housing 32, the side magnetically permeable plate 25 is disposed on the side wall of the magnetically yoke 21, and a magnetic gap 22 is formed between the central magnet 23 and the magnetically permeable Between the side walls of the yoke 21, it need not be detailed here.

Further, as shown in FIG. 2, FIG. 9 and FIG. 10, a first electrical connection member 41 and a second electrical connection member for electrically connecting the voice coil 13 of the vibration system 10 with an external circuit are provided on the outer side of the casing 30. 42. The first electrical connection member 41 and the second electrical connection member 42 are respectively connected to two leads of the voice coil 13 of the vibration system 10. In this way, by separating the casing 30 and setting the electrical connection point of the voice coil 13 and an external circuit outside the casing 30, a larger space can be provided for the magnetic circuit system 20, and the acoustic performance of the sound emitting device 100 can be improved; At the same time, it is also beneficial to increase the effective radiation area of the diaphragm, so that the sound emitting device 100 can obtain better acoustic performance.

Further, as shown in FIG. 2, FIG. 9, and FIG. 10, the first electrical connection member 41 and the second electrical connection member 42 are disposed at one end of a short side of the casing 30, so that the sound emitting device 100 and the portable device are portable. The terminal 1000 is used for assembly.

Specifically, as shown in FIG. 9 and FIG. 10, in order to facilitate the connection between the first electrical connection member 41 and the second electrical connection member 42 to an external circuit, one end of a short side of the first casing 31 is outwardly provided with a mounting device. A convex portion 311, the first electrical connection member 41 has a first pad 411 exposed on the mounting convex portion 311, and the second electrical connection member 42 has a third pad 421 exposed on the mounting convex portion 311, The first pad 411 and the third pad 421 are used to be electrically connected to an external circuit.

To facilitate the electrical connection between the first electrical connector 41 and the second electrical connector 42 and the voice coil 13 of the vibration system 10, the first electrical connector 41 also has a second pad exposed on the first housing 31. 412. The second electrical connector 42 also has a fourth pad 422 exposed on the first housing 31. The two leads of the voice coil 13 are respectively connected to the second pad 412 and the fourth solder. The disc 422 is electrically connected.

Further, as shown in FIG. 9 and FIG. 10, the first casing 31 is further provided with a third electrical connection member 43 and an electrical adapter 44, and the third electrical connection member 43 is disposed on the first casing. An end of 31 far from the mounting protrusion 311, and two ends of the electrical adapter 44 are respectively connected to the third electrical connection 43 and the second electrical connection 42; a lead of the voice coil 13 passes through the third electrical in order. The connection member 43 and the electrical adapter 44 are electrically connected to the second electrical connection member 42, and the other lead is electrically connected to the first electrical connection member 41.

In this way, only three electrical connecting members 50 are needed to lead the electrical connection points of the voice coil 13 and the external circuit to the outside of the first casing 31, so that the structure of the first casing 31 is simple and easy to manufacture.

Further, as shown in FIGS. 9 and 10, the third electrical connector 43 has a fifth pad 431 exposed on the upper side of the first case 31 and a sixth solder exposed on the lower side of the first case 31. Disk 432, the second pad 412 is exposed on the upper side of the first case 31, the fourth pad 422 is exposed on the lower side of the first case 31, and the sixth pad 432 and the fourth Pads 422 are disposed near the same long side of the first housing 31; both ends of the electrical adapter 44 are connected to the sixth pad 432 and the fourth pad 422, respectively; the two leads of the voice coil 13 are connected respectively On the fifth pad 431 and the second pad 412. Specifically, the mounting protrusion 311 is also disposed near a long side of the first casing 31, so that it can play a role in preventing fools.

It can be understood that connecting the two leads of the voice coil 13 to the fourth pad 422 and the fifth pad 431 provided at both ends of the first casing 31 can reduce the risk of the wires of the voice coil 13 being disconnected when the sounding device 100 works. At the same time, it can also reduce or even eliminate the noise caused by the coil lead.

Specifically, as shown in FIG. 9 and FIG. 10, a lead groove 312 extending from the sixth pad 432 to the fourth pad 422 is provided on the lower side of the first case 31, and the electrical adapter 44 is embedded. In the lead groove 312. After the first casing 31 and the second casing 32 are assembled, the second casing 32 covers the notch of the lead groove 312, and the second casing 32 covers the fourth pad 422 and the sixth pad 432, which can be avoided External factors break the conduction circuit of the voice coil 13 in the casing 30.

Specifically, the first electrical connection member 41, the second electrical connection member 42, the third electrical connection member 43, and the electrical adapter 44 may be integrated into the first housing 31, and the center magnet and the side magnet may be bonded at the same time. To the second casing 32, and then splice and assemble the first casing 31 and the second casing 32 into the casing 30, and then the two leads of the voice coil 13 can be soldered to the fourth pad 422 and the fifth pad 431. In this way, the difficulty of assembly is reduced, so that the production efficiency of the sounding device 100 can be improved, the production cycle of the sounding device 100 can be shortened, and the magnetic circuit space can be further increased to improve the acoustic performance of the product.

In this embodiment, the electrical adapter 44 may be provided as a brocade wire, an enameled wire, or a thick enameled wire.

Further, the sound generating device 100 of the present invention may be either a single diaphragm sound generating device 100 or a double diaphragm sound generating device 100. When the sound generating device 100 of the present invention is configured as a single diaphragm, reference may be made to the structural form of the existing single diaphragm sound generating device 100 and the embodiments of the present invention, which need not be described in detail here.

In some embodiments provided by the present invention, the sound generating device 100 is configured as a dual diaphragm. Specifically, as shown in FIG. 1 to FIG. 8, the vibration system 10 includes a first diaphragm 11 and a second diaphragm that are oppositely disposed. A diaphragm 12, the second diaphragm 12 is mounted on a side of the second housing 32 remote from the first housing 31, and a voice coil 13 of the vibration system 10 is provided on the first diaphragm 11 Underside.

The magnetic circuit system 20 is disposed between the first diaphragm 11 and the second diaphragm 12, and a first acoustic cavity (not shown) is formed between the magnetic circuit system 20 and the first diaphragm 11. The voice coil 13 partially extends into the magnetic gap 22 of the magnetic circuit system 20; a second acoustic cavity (not shown in the figure) is formed between the magnetic circuit system 20 and the second diaphragm 12; There are air holes.

The vibration principle of the first diaphragm 11 can be referred to the existing form. Specifically, the voice coil 13 is fixedly connected to the first diaphragm 11 and penetrates into the magnetic gap 22, and the current of the voice coil 13 is changed by different amperes. The vibration of the force causes the vibration of the voice coil 13 to drive the first diaphragm 11 to vibrate. The energy conversion mode is electric energy-mechanical energy-sound energy. In order to adjust the frequency characteristics of the vibration, a weight can be provided.

The air guide hole may be opened only on the bottom wall of the magnetic yoke 21 to communicate with the magnetic gap 22 and the second acoustic cavity; or in the middle position of the magnetic circuit system 20, that is, it passes through the central magnetic guide plate 24 and the center in order. The magnet 23 and the magnetically conducting yoke 21 communicate with the first acoustic cavity and the second acoustic cavity; or opened on the side of the central magnet 23 and bent downward in the central magnet 23 and penetrate through the bottom wall of the magnetically conducting yoke 21 to communicate the magnetic gap 22 and the first Two sound chambers. As long as the first acoustic cavity and the second acoustic cavity can be communicated, and the flow area of the air guide hole is large enough, the airflow circulating in the air guide hole can push the second diaphragm 12 to emit sound.

The sound emitting device 100 of the present invention uses two diaphragms to generate sound through vibration, and uses only one set of voice coil 13 and magnetic circuit system 20 to achieve two-way diaphragm sounding, which makes the sound emitting device 100 small in size and convenient for wide application in portable terminals 1000. Specifically, when the sound generating device 100 of the present invention works, the magnetic circuit system 20 directly drives the first diaphragm 11 to vibrate, so that the air in the first acoustic cavity is compressed or expanded. Since a guide is provided between the first acoustic cavity and the second acoustic cavity, The air holes communicate with each other. The air circulates through the air guide holes. Under the impetus of the airflow, the second diaphragm 12 vibrates and sounds, and the second acoustic cavity expands or compresses in conjunction with it, thereby forming the first diaphragm 11 on the front to actively radiate. The bidirectional sound emitting structure of the second diaphragm 12 passively radiates. When applied to the portable terminal 1000, the sound emitting device 100 of the present invention can emit sound in two directions of the front and the back of the portable terminal 1000, respectively.

It can be understood that the above design is based on the circulation of air in the air holes to drive the second diaphragm 12 to emit sound. In a further embodiment of the present invention, in order to drive the second diaphragm 12 to generate sound, a connection can be added through The component 50 connects the first diaphragm 11 and the second diaphragm 12 to drive the second diaphragm 12 to emit sound. Of course, the connecting member 50 may not be added, and the second diaphragm 12 may be driven to generate sound only by the air circulation in the air guide hole.

Further, as shown in FIG. 3 to FIG. 6, the sound emitting device 100 further includes a connecting member 50. The connecting member 50 is at least partially disposed in the air guide hole, and an upper end of the connecting member 50 is fixed to the first diaphragm 11. The lower end is fixedly connected to the second diaphragm 12. In this way, when the connecting member 50 is pushed or pulled, the first diaphragm 11 will drive the second diaphragm 12 to vibrate and generate sound synchronously. In addition, while the first diaphragm 11 and the second diaphragm 12 make sounds in conjunction with each other, since the air in the first and second acoustic chambers can circulate through the air guide holes, the difference in air pressure between the two is small, giving the first diaphragm The resistance caused by the vibration of 11 and the second diaphragm 12 is also relatively small, so that better acoustic performance can be achieved.

Specifically, compared to driving the second diaphragm 12 to emit sound only through the air circulation in the air guide hole, when the second diaphragm 12 is driven to vibrate and sound through the connecting member 50, the specific structure of the air guide hole will also adapt. Variation, as long as it is convenient for the connecting member 50 to be movable in the air guide hole, the first diaphragm 11 and the second diaphragm 12 are linked, and the connecting member 50 and the inner wall surface of the air guide hole are formed to communicate the first acoustic cavity and the first The air flow channel of the two sound chambers is sufficient.

Specifically, the connection between the connecting member 50 and the first diaphragm 11 or the second diaphragm 12 may be glue bonding or integrally formed by injection molding; in this embodiment, the upper and lower ends of the connecting member 50 They are respectively adhered to the first diaphragm 11 or the second diaphragm 12.

Specifically, in order to reduce the weight of the component while ensuring the strength, the material of the connecting member 50 includes, but is not limited to, carbon fiber materials, aluminum foil / magnesium aluminum alloy / magnesium lithium alloy and other metal materials, PEN (polyethylene naphthalate) ) / PI (polyimide) / LCP (Liquid Crystal Polymer) / PC (polycarbonate) / PPA (Polyphthalamide polyphthalamide) and other plastic materials, or porous materials. The processing methods of the connecting member 50 include, but are not limited to, winding, blow molding, injection molding, stamping, machining, and the like.

As shown in FIGS. 3 to 6, in the present invention, air holes are opened on the bottom wall of the magnetic yoke 21 to communicate the magnetic gap 22 and the second acoustic cavity, and the connecting member 50 is provided to connect the first diaphragm 11 and the second acoustic cavity. As an example, the diaphragm 12 is used to drive the sound of the second diaphragm 12 to explain the present invention.

Specifically, as shown in FIG. 3 to FIG. 6, the air guide hole includes a magnetic gap 22 provided on the second housing 32 and communicating with the magnetic gap 22 of the magnetic circuit system 20 and a side air guide hole 28 of the second acoustic cavity. Specifically, Since the magnetic yoke is part of the bottom wall of the second casing, the side air guide hole 28 may be provided on the magnetic yoke (that is, on the bottom wall of the second casing), or it may be disposed on the second casing. The position of the bottom wall outside the yoke is not limited. A plurality of the side air guide holes 28 are provided, and a plurality of the side air guide holes 28 are arranged at intervals along the circumferential direction of the magnetic gap 22;

The connecting member 50 includes a connecting base plate 51 and a plurality of connecting convex portions 52 protruding from the connecting base plate 51. The connecting base plate 51 is provided between the second casing 32 and the second diaphragm 12 and is connected to the second diaphragm 32. The diaphragm 12 is fixedly connected, and the plurality of connection protrusions 52 are respectively fixedly connected to the first diaphragm 11 through the plurality of side air guide holes 28 respectively.

In this way, it can be achieved that the first vibrating membrane 11 will drive the second vibrating membrane 12 to emit sound synchronously. At the same time, since the side air guide hole 28 is disposed on the edge side of the diaphragm, if only one connection convex portion 52 is provided, the synchronization of the vibration of the first diaphragm 11 and the second diaphragm 12 is poor; and the present invention, By providing a plurality of connection protrusions 52, the uniformity of the force transmission between the first diaphragm 11 and the second diaphragm 12 can be improved, and the synchronization of the vibration of the first diaphragm 11 and the second diaphragm 12 can be improved.

It can be understood that the greater the number of the connecting protrusions 52, the better the synchronization of the vibration of the first diaphragm 11 and the second diaphragm 12, but at the same time, the greater the number of the connecting protrusions 52, the more The more complicated the structure of the sound generating device 100 is, and because the connection convex portion 52 is disposed in the magnetic gap 22, the influence on the movement of the voice coil 13 in the magnetic gap 22 will be greater. Therefore, the number of the connecting protrusions 52 is preferably two or three, and the two or three connecting protrusions 52 are symmetrical in the center.

In this embodiment, the housing 30 is substantially rectangular, and the connection bottom plate 51 is also substantially rectangular. The number of the connection protrusions 52 is preferably two, and the two connection protrusions 52 are symmetrically disposed in the housing. The two ends of the short side connecting the bottom plate 51 are described.

Further, as shown in FIGS. 12 to 15, in the first to seventh embodiments of the connecting member 50, the connecting convex portion 52 is provided in a plate shape. In this way, not only the space occupied by the connection convex portion 52 in the magnetic gap 22 can be reduced, but also the structural strength during transmission can be ensured, and the energy loss can be reduced by reducing the mass. The transmission of the connecting member 50 refers to pushing or pulling the second diaphragm 12 with the first diaphragm 11 as a reference.

As shown in FIG. 12, in the second embodiment of the connecting member 50, the connecting convex portion 52 is provided in a plate shape, and an upper end of the connecting convex portion 52 is formed inward, outward, or partially inward and partially inward. Outer bent connection flange 521. In this way, the contact area between the connection convex portion 52 and the first diaphragm 11 can be increased, so that the connection strength between the connection convex portion 52 and the first diaphragm 11 can be enhanced, and the reliability of the sound emitting device 100 can be enhanced.

As shown in FIG. 13, in the third embodiment of the connecting member 50, the connecting convex portion 52 is provided in a plate shape, and the lower end of the side of the connecting convex portion 52 is bent inward to extend to form a connection with the connecting base plate 51. The side reinforcing portion 522 may be provided on one side of the connecting convex portion 52 or on both sides of the connecting convex portion 52. In this way, the structural strength of the connecting member 50 can be enhanced.

As shown in FIG. 14, in the fourth embodiment of the connecting member 50, the connecting convex portion 52 is provided in a plate shape, and the inner lower end of the connecting convex portion 52 is provided with a reinforcing rib 523 connected to the connecting bottom plate 51, and / Or, the connecting bottom plate 51 is provided with a reinforcing rib structure, and / or the connecting convex portion 52 is provided with a reinforcing rib structure. In this way, the structural strength of the connecting member 50 can be enhanced.

As shown in FIG. 15, in a fifth embodiment of the connecting member 50, the connecting bottom plate 51 is provided in a hollow shape. In this way, not only the structural strength of the transmission can be ensured, but also the energy loss can be reduced by reducing the mass.

In a sixth embodiment of the connecting member 50, the connecting convex portion 52 is provided in a plate shape, and the connecting convex portion 52 is provided in a hollow shape. In this way, not only the structural strength of the transmission can be ensured, but also the energy loss can be reduced by reducing the mass. At the same time, the connection convex portion 52 is provided in a hollow shape, so that the air on both sides of the connection convex portion 52 can be circulated, so that the effective circulation area can be indirectly increased.

As shown in FIG. 16, in the seventh embodiment of the connecting member 50, the connecting bottom plate 51 is provided in a circular shape; of course, the connecting bottom plate 51 may also be provided in a square shape, a track shape, or an oval shape.

It can be understood that the second to seventh embodiments of the connecting member 50 can be combined with each other as long as they do not contradict each other.

Further, as shown in FIGS. 3 to 5, the first diaphragm 11 includes a first central portion 111, a first folded ring portion 112 provided around the first central portion 111, and a first folded portion 112 provided around the first folded portion 112. The first fixing portion 113; the connecting convex portion 52 is fixed to the lower side of the first central portion 111; the first central portion 111 is a flat sheet-like structure; and the first folded ring portion 112 is a protrusion Structure, or the first folded ring portion 112 is a wavy structure composed of at least one protrusion and at least one depression

In this embodiment, the first central portion 111 is used to bear the force of the connecting member 50 and then vibrate and emit sound, that is, the joint radiation sound. By setting the first central portion 111 as a planar sheet structure, the first diaphragm 11 It takes up less space in the up and down direction and can generate sufficiently large amplitudes. The first folding ring portion 112 provides a certain compliance for the movement of the central portion, that is, provides a certain flexibility, so that the first central portion 111 is more easily pushed by the connecting member 50 or air.

Specifically, the sound emitting device 100 further includes a front cover 60, and the first fixing portion 113 is clamped between the front cover 60 and the first casing 31.

Based on the same principle as the first diaphragm 11, the second diaphragm 12 includes a second central portion 121, a second folded ring portion 122 provided around the second central portion 121, and a second folded ring portion 122. A second fixing portion 123 is provided; the connecting bottom plate 51 is fixed on the upper side of the second central portion 121; the second central portion 121 is a planar sheet structure, and the second folded ring portion 122 is formed by a convex Structure, or the second folded ring portion 122 is a wavy structure composed of at least one protrusion and at least one depression.

Specifically, the sound emitting device 100 further includes a rear cover 70, and the second fixing portion 123 is clamped between the rear cover 70 and the second casing 32.

In particular, the first central portion 111 and the second central portion 121 are both provided in a sheet-like structure, so that the sound generating device 100 provided in the present invention can form a thin structure in the vertical direction as a whole, so that it is easier to apply in a flat shape Installation space.

Further, as shown in FIGS. 3 to 5, the first diaphragm 11 further includes a first reinforcing portion 114 coupled to the first central portion 111. The first reinforcing portion 114 may be provided mainly to increase the rigidity of the first diaphragm 11, reduce the divisional vibration, and improve the high-frequency performance.

Further, as shown in FIGS. 3 to 5, the upper end of the connection convex portion 52 is bonded to the first diaphragm 11, and the peripheral edge of the first reinforcement portion 114 corresponds to the connection convex portion 52 and the first central portion 111. A first notch 1141 is provided at the bonding position. In this way, the adhesion effect of the connecting convex portion 52 and the first central portion 111 can be easily enhanced.

Based on the same principle as the first diaphragm 11, the second diaphragm 12 further includes a second reinforcing portion 124 coupled to the second central portion 121, and the periphery of the second reinforcing portion 124 corresponds to A second notch 1241 is provided at a bonding portion between the peripheral edge of the connection bottom plate 51 and the second central portion 121. In this way, the adhesion effect between the connection bottom plate 51 and the second central portion 121 can be easily enhanced.

It should be noted that the above description is based on the use of independent connecting members to connect the first diaphragm and the second diaphragm to achieve two-way sound as an example, but this technical solution can be applied not only to this situation, but also to other methods. A structure for realizing two-way sound. For example, the connecting member may be a structure in which a second reinforcing portion coupled to the second diaphragm is integrally bent and extended in a direction close to the second diaphragm / voice coil. That is to say, instead of introducing a single connecting member separately, the second reinforcing portion can be integrally bent and extended to the bottom end of the voice coil or the first diaphragm, which can also be achieved.

Alternatively, the voice coil may be wound around the voice coil skeleton, and the voice coil skeleton is integrally bent and extended in a direction close to the second diaphragm / second reinforcing portion, thereby realizing the first diaphragm The connection to the second diaphragm is fixed. That is to say, the application of this technical solution is not limited to the above-mentioned examples. Whether it is a circular sounding device or a rectangular sounding device, whether it is a single magnetic circuit structure or a multi-magnetic circuit structure, whether it is unidirectional or bidirectional, whether What form is used as the connecting member and the like is not a limited application range of the technical solution, as long as the traditional shell is split into two parts in the sounding device, and the magnetic yoke in the magnetic circuit system and the second The shell can be injection molded as a whole.

Of course, in other embodiments of the present invention, the air guide hole is also opened in the middle position of the magnetic circuit system 20. Specifically, the air guide hole includes a central air guide hole (not shown) penetrating the middle position of the magnetic yoke 21 and the magnetic circuit system 20. In this embodiment, the central air guide hole sequentially penetrates the central magnetic guide plate 24, The central magnet 23 and the magnetically conducting yoke 21 communicate with the first acoustic cavity and the second acoustic cavity; one connecting member 50 is provided and is disposed in the central air guide hole, and the upper end of the connecting member 50 is connected to the first diaphragm 11. The lower end of the connecting member 50 is connected to the second diaphragm 12, wherein the connecting member 50 is preferably a hollow cylinder; it need not be described in detail here.

Of course, in other embodiments of the present invention, a combination of the central air guide hole and the side air guide hole 28 may also be adopted, and it is not necessary to repeat them one by one here.

It is particularly emphasized that the present invention has at least the following technical effects:

1) Injection molding the magnetic yoke 21 and the second case 32 into one body, and fixing the side magnetically permeable plate 25 to the first case 31 by injection molding, which can solve the assembly of the magnetic yoke 21, the side magnetically permeable plate 25 and the casing 30 The inconvenience problem, thereby improving the assembly efficiency of the sound generating device 100;

2) Two-way sound is realized through a voice coil 13, the structure is simple and easy to implement;

3) The product pads protrude from the outside of the casing 30, on the one hand, the effective radiation areas of the first and second diaphragms 11 and 12 can be kept consistent, thereby ensuring the acoustic performance of the first and second diaphragms 11 and 12 Consistent; on the other hand, the effective radiation area of the first diaphragm 11 and the second diaphragm 12 can be maximized to obtain the best acoustic performance;

4) The split housing 200 and the design that sets the electrical connection point of the voice coil 13 and external circuits outside the housing 30 can provide more space for the magnetic circuit system 20 and further improve the acoustic performance of the product.

The invention also provides a portable terminal. As shown in FIG. 1 to FIG. 19, the portable terminal 1000 includes a housing 200 having an accommodating cavity 201 therein. The portable terminal 1000 further includes a sound emitting device 100. For a specific structure of the sound emitting device 100, refer to the foregoing embodiment. Since the portable terminal 1000 adopts all the technical solutions of all the embodiments described above, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated one by one here.

Among them, as shown in FIG. 16 to FIG. 19, the sound emitting device 100 is installed in the accommodating cavity 201, and the housing 200 is provided with a first sound hole 202 corresponding to the first diaphragm 11 and a first sound hole 202 corresponding to the second diaphragm 12.二 声 孔 203。 Two sound holes 203.

Preferably, in order to shorten the propagation path of the sound inside the casing 200 and reduce the acoustic resistance, the first sound hole 202 is opened at a position of the casing 200 directly opposite the first diaphragm 11, and the second sound hole 203 is opened at the housing 200. Is directly opposite the second diaphragm 12.

Further, the housing 110 of the portable terminal 100 has a front surface and a rear surface opposite to each other, wherein the first sound hole 130 is provided on the front surface and the second sound hole 140 is provided on the reverse surface, thereby realizing two-way synchronous sound emission.

The above is only a preferred embodiment of the present invention, and therefore does not limit the scope of the patent of the present invention. Any equivalent structural transformation or direct / indirect use of the description and drawings of the present invention under the inventive concept of the present invention All other related technical fields are included in the patent protection scope of the present invention.

Claims (21)

1. A sound generating device includes a vibration system and a magnetic circuit system. The vibration system and the magnetic circuit system are fixed on a casing, wherein the casing includes a first casing and a second casing connected and fixed together. The vibration system includes a first diaphragm and the magnetic circuit system includes a magnetically permeable yoke, wherein the first diaphragm is mounted on a side of the first housing remote from the second housing, The magnetic yoke is injection-molded into the second casing as a whole.
2. The sound generating device according to claim 1, wherein the magnetic circuit system further comprises a central magnetic circuit portion and a side magnetic circuit portion, and a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion;

   The central magnetic circuit portion includes a central magnet provided on the magnetic yoke and a central magnetic plate provided on the central magnet, and the side magnetic circuit portion includes a side spaced apart from the central magnetic plate. The magnetically permeable plate is fixed to the first case by injection molding.
3. The sound generating device according to claim 2, wherein the side magnetic circuit portion further comprises a first side magnet and a second side magnet respectively provided on opposite sides of the center magnet, and the side magnetically conductive plate The method includes a first side magnetically permeable plate and a second side magnetically permeable plate respectively provided on the first side magnet and the second side magnet.
4. The sound generating device according to claim 3, wherein the magnetic yoke has a flat plate shape and is provided to constitute a bottom wall of the second casing.
5. The sound-emitting device according to claim 4, wherein a concave / convex structure is provided on a side of the first casing facing the second casing, and the second casing faces the first casing One side of the body is provided with a matching protrusion / depression structure; the first housing and the second housing are positioned by the matching protrusion and depression structure, and the first housing It is glued and fixed with the second shell.
6. The sound generating device according to claim 1, wherein the first housing is provided with a first electrical connection member and a second electrical connection member for electrically connecting the voice coil of the vibration system with an external circuit, The first electrical connector and the second electrical connector are respectively connected to two leads of a voice coil of the vibration system.
7. The sound emitting device according to claim 6, wherein the first case is provided in a rectangular shape, and the first and second electrical connectors are provided at one end of a short side of the first case. .
8. The sound generating device according to claim 7, wherein one end of a short side of the first housing is provided with a mounting protrusion outwardly;

   The first electrical connection member has a first pad and a second pad that are respectively exposed at the mounting protrusion and located inside the first housing; the second electrical connection member has a respectively exposed at the installation A convex portion and a third pad and a fourth pad located inside the first casing;

   The first pad and the third pad are used for electrical connection of an external circuit.
9. The sound generating device according to claim 8, wherein a third electrical connector and an electrical adapter are further provided on the first casing, and the third electrical connector is disposed on the first casing One end away from the mounting protrusion, and two ends of the electrical adapter are respectively connected to the third electrical connection member and the second electrical connection member;

   One lead of the voice coil is electrically connected to the second electrical connector in turn via the third electrical connector and the electrical adapter, and the other lead is electrically connected to the first electrical connector.
10. The sound emitting device according to claim 9, wherein the third electrical connection member has a fifth pad exposed on an upper side of the first case and a first pad exposed on a lower side of the first case. Six pads, the second pad is exposed on the upper side of the first case, the fourth pad is exposed on the lower side of the first case, and the sixth pad and the A fourth pad is disposed near the same long side of the first casing;

    Two ends of the electrical adapter are connected to the sixth pad and the fourth pad, respectively;

    Two leads of the voice coil are connected to the fifth pad and the second pad, respectively.
11. The sound emitting device according to claim 10, wherein a lead groove extending from the sixth pad to the fourth pad is provided on the lower side of the first housing, and the electrical adapter Buried in the lead groove.
12. The sound emitting device according to any one of claims 1 to 11, wherein the vibration system further comprises a second diaphragm disposed opposite to the first diaphragm, and the second diaphragm is mounted on the A side of the second casing remote from the first casing, and a voice coil of the vibration system is disposed below the first diaphragm;

    The magnetic circuit system is provided between the first diaphragm and the second diaphragm, a first acoustic cavity is formed between the magnetic circuit system and the first diaphragm, and the voice coil portion extends into the magnetic In the magnetic gap of the magnetic circuit system, a second acoustic cavity is formed between the magnetic circuit system and the second diaphragm, and an air guiding hole is provided between the first acoustic cavity and the second acoustic cavity.
13. The sound emitting device according to claim 12, wherein the sound emitting device further comprises a connecting member, the connecting member is at least partially provided in the air guide hole, and an upper end of the connecting member is connected to the first diaphragm. The lower end is fixedly connected to the second diaphragm.
14. The sound-emitting device according to claim 13, wherein the air guide hole includes an air guide hole provided on the second housing and communicating with the magnetic gap of the magnetic circuit system and the second acoustic cavity. A plurality of the side air guide holes are provided, and a plurality of the side air guide holes are arranged at intervals along the circumferential direction of the magnetic gap;

    The connecting member includes a connecting base plate and a plurality of connecting convex portions protruding from the connecting base plate. The connecting base plate is provided between the second casing and the second diaphragm, and is connected to the first The two diaphragms are fixedly connected, and the plurality of connection protrusions are respectively fixedly connected to the first diaphragm through a plurality of the side air guide holes respectively.
15. The sound generating device according to claim 14, wherein the connection convex portion is provided in a plate shape; and an upper end of the connection convex portion is formed with a connection bent inwardly, outwardly, or partially inwardly and outwardly. Flanging; and / or

    The connection convex portion is provided in a plate shape, and the lower end of the side of the connection convex portion is bent inward to extend to form a side reinforcement portion connected to the connection bottom plate; and / or

    A reinforcing rib connected to the connection bottom plate is provided at the lower end of the inner side of the connection convex portion; and / or

    The connection bottom plate is provided in a hollow shape; and / or

    The connection convex portion is provided in a plate shape, and the connection convex portion is provided in a hollow shape; and / or

    The connecting bottom plate is provided in a square shape, a circular shape, a racetrack shape, or an oval shape.
16. The sound generating device according to claim 14, wherein the first diaphragm includes a first center portion, a first folded ring portion provided around the first center portion, and a first fixed portion provided around the first folded portion. The connecting convex part is fixed on the lower side of the first central part, the first folded ring part is a structure composed of one protrusion, or the first folded ring part is composed of at least one protrusion and at least one Wavy structures formed by depressions; and / or

    The second diaphragm includes a second center portion, a second folded ring portion provided around the second center portion, and a second fixed portion provided around the second folded portion; the connection base plate is fixed to the second center portion. On the upper side, the second folded ring portion is a structure composed of one protrusion, or the second folded ring portion is a wavy structure composed of at least one protrusion and at least one depression.
17. The sound emitting device according to claim 16, wherein the first diaphragm further includes a first reinforcing portion coupled to the first central portion, and a periphery of the first reinforcing portion corresponds to the connection A first notch is provided at a bonding portion between the convex portion and the first central portion; and / or

    The second diaphragm further includes a second reinforcing portion coupled to the second central portion, and a peripheral edge of the second reinforcing portion is provided corresponding to a peripheral edge of the connection base plate and the second central portion is bonded. There is a second gap.
18. The sound emitting device according to claim 13, wherein the connecting member is a second reinforcing portion coupled to the second diaphragm, and is integrally bent in a direction close to the second diaphragm / voice coil. Extended structure

    Alternatively, the voice coil is wound around the voice coil skeleton, and the connecting member is a structure in which the voice coil skeleton is integrally bent and extended in a direction close to the second diaphragm / second reinforcing portion.
19. The sound-emitting device according to claim 12, wherein the air guide hole includes a central air guide hole penetrating a middle position of the magnetic yoke and the magnetic circuit system.
20. A portable terminal includes a housing, and the housing has an accommodating cavity therein, further comprising a sound emitting device according to any one of claims 1 to 19, wherein the sound emitting device is installed in the housing Cavity, the housing is provided with a first acoustic hole corresponding to the first diaphragm, and a second acoustic hole corresponding to the second diaphragm.
21. The portable terminal according to claim 20, wherein the casing has a front surface and a rear surface opposite to each other, the first sound hole is provided on the front surface, and the second sound hole is provided on the reverse surface.

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